We are doing a one-day rental from Alamo, picking up at the Dolphin next Saturday and driving to the port on Sunday morning to board the Wonder for the WBPC cruise. I have a full-size car reserved for $45 plus gas and tolls, quite a bit less than the
DCL bus from resort to port for the two of us. I paid exactly the same for a similar rental when we sailed on the Fantasy last November. I booked using the Alamo codes from my Costco membership.
At the port, I usually drop our checked bags with the porters and leave DW with her carry-on bag and drive to the car rental drop off, taking the shuttle back with just my own carry-on bag to manage.